In a court filing on Friday in federal court in Boston, the attorneys requested that the start date of the trial, which is currently scheduled to begin in November, be pushed back to September 2015. The lawyers cited the “massive amount” of evidence that they must evaluate, among other concerns.

Tsarnaev, 21, faces several charges that could bring the death penalty for his alleged role in the April 15, 2013 bombings, which killed three people and wounded more than 260.